1/* Copyright 2022 The TensorFlow Authors. All Rights Reserved.
2
3Licensed under the Apache License, Version 2.0 (the "License");
4you may not use this file except in compliance with the License.
5You may obtain a copy of the License at
6
7 http://www.apache.org/licenses/LICENSE-2.0
8
9Unless required by applicable law or agreed to in writing, software
10distributed under the License is distributed on an "AS IS" BASIS,
11WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12See the License for the specific language governing permissions and
13limitations under the License.
14==============================================================================*/
15
16#include <string>
17
18#include "mlir/Dialect/Func/IR/FuncOps.h" // from @llvm-project
19#include "mlir/IR/Attributes.h" // from @llvm-project
20#include "mlir/IR/Operation.h" // from @llvm-project
21#include "mlir/IR/SymbolTable.h" // from @llvm-project
22#include "mlir/Pass/Pass.h" // from @llvm-project
23#include "tensorflow/dtensor/cc/constants.h"
24#include "tensorflow/dtensor/mlir/dtensor_mlir_passes.h"
25
26namespace tensorflow {
27namespace dtensor {
28
29namespace {
30#define GEN_PASS_DEF_DTENSORFUNCTIONRENAMING
31#include "tensorflow/dtensor/mlir/dtensor_passes.h.inc"
32
33struct DTensorFunctionRenaming
34 : public impl::DTensorFunctionRenamingBase<DTensorFunctionRenaming> {
35 void runOnOperation() override {
36 mlir::ModuleOp module = getOperation();
37
38 const std::string append =
39 module->getAttrOfType<mlir::StringAttr>(dtensor::kCacheKey)
40 .getValue()
41 .str();
42
43 // If the cache key isn't set, simply return without renameing functions.
44 if (append.empty()) return;
45
46 mlir::SymbolTableCollection symbol_table;
47 mlir::SymbolUserMap symbolUsers(symbol_table, module);
48
49 for (mlir::func::FuncOp func_op :
50 llvm::make_early_inc_range(module.getOps<mlir::func::FuncOp>())) {
51 // Only rename private functions, functions which are public (i.e. the
52 // main function of the module), must have stable names since they are
53 // public and may be used by other modules/pieces of code.
54 if (func_op.getVisibility() != mlir::SymbolTable::Visibility::Private)
55 continue;
56 std::string new_name = absl::StrCat(
57 mlir::SymbolTable::getSymbolName(func_op).getValue().str(), append);
58 symbolUsers.replaceAllUsesWith(
59 func_op, mlir::StringAttr::get(&getContext(), new_name));
60 mlir::SymbolTable::setSymbolName(func_op, new_name);
61 }
62 };
63};
64
65} // namespace
66
67std::unique_ptr<mlir::OperationPass<mlir::ModuleOp>>
68CreateFunctionRenamingPass() {
69 return std::make_unique<DTensorFunctionRenaming>();
70}
71
72} // namespace dtensor
73} // namespace tensorflow
74